slug with retracted antennae and eyes during hibernation in a secluded place under a stone

animal slug mollusk gastropod hibernation retracted antennae eyes secluded ukraine nature wildlife macro closeup invertebrate slow soft body shell moist damp habitat environment underground hidden camouflage resting dormant slumber cool shelter fauna ecosystem organism slimy mucus wild survival adaptation terrestrial nocturnal tentacles eyestalks detail texture motionless protection